Question

Which situation has the greatest pressure? A. Atmospheric pressure at sea level, equal to 1.01 X 105 N/m2 B. The pressure that a person of mass 70 kg exerts on the floor when she balances on the ball of one foot, with an area of contact of 50 cm2 C. The pressure that a physics textbook of mass 2.5 kg exerts on a desk when it is lying flat on the desk, with an area of contact of 22 cm X 28 cm

(a) Identify the empirical formula of this compound.

Answer 1

B

Step-by-step explanation:

We are given that

A.Atmospheric pressure=
`P_0=1.01* 10^5N/m^2`

B.Mass,m=70 kg

Area,A=
`50 cm^2=50* 10^(-4) m^2`

`1 m^2=10^4 cm^2`

Force=mg

Where
`g=9.8 m/s^2`

Using the formula

`F=70* 9.8=686 N`

`P=(F)/(A)=(686)/(50* 10^(-4))=1.37* 10^5 N/m^2`

C.Mass ,m=2.5 kg

Area,A=
`22* 28=616 cm^2=616* 10^(-4) m^2`

Pressure=
`(mg)/(A)=(2.5* 9.8)/(616* 10^(-4))=397.7 N/m^2`

In situation B has greatest pressure.